【摘要】 以X射线衍射、电子显微镜和差热分析为手段,研究了PbO-TiO₂-Al₂O₃-SiO₂系铁电微晶玻璃的显微结构的整个形成过程。随着加热温度的上升,样品先后发生基玻璃的分相、烧绿石型介稳初晶相的析出与分解、钙钛矿型稳定晶相的形成、铁电畴结构的出现。本文还着重讨论了钙钛矿型晶相由“受夹”态到“自由”态的转变及其对样品铁电性的影响。更多还原

【Abstract】 By means of XRD, TEM and DTA, the whole microstructure forming process of a ferroelectric glass-ceramics in PbO-TiO₂-Al₂O₃-SiO₂ system has been studied. With the increase of temperature, the phase separation of parent glass, the precipitation of a metastable pyrochlore-type primary crystalline phase followed by its decomposition, the formation of a stable perovskite-type crystalline phase and the emergence of ferroelectric domains occur in the samples. The transition from the clamped state to the free state of the perovskite-type phase, and its effect on ferroelectricity of the samples are emphasized in the discussion.更多还原